The major vessel delivering deoxygenated blood to the lungs is the ______.
A. pulmonary trunk
B. pulmonary vein
C. aorta
D. superior vena cava
Answer: A. pulmonary trunk
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Platyhelminthes can live without a circulatory or respiratory system because
A) They rely on their digestive system. B) They are dorsoventrally flattened. C) The kidney excretes excess waste materials. D) The epidermis secretes lubricants.
Which of the following has the lowest partial pressure in inhaled dry air?
A) oxygen B) nitrogen C) water vapor D) carbon dioxide E) mercury
Shortly after birth, the foramen ovale of the fetal heart ceases to function as an open pathway for blood.
Answer the following statement true (T) or false (F)
Which is NOT true about cofactors involved in enzymatic reactions?
A. They may alter the conformation of the enzyme. B. They may be a metal such as iron. C. They may be a substrate in a catalyzed reaction. D. There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed. E. Only a small number of cofactor molecules may be needed to maintain enzyme activity.